What causes car to start & run fine until it heats up to approx. 80 degrees?

1990 MERCEDES BENZ 420SEL
163,000 MILES
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DWIGHTSR
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When it dies, it is like it is shut off by the key.
Sometimes it immediately starts back up.
Have changed both fuel pumps, filter, and plugs.
Have changed the electronic ignition control module.
Car had been sitting for approx. a year.
When idling the car runs as smooth as the day it was new.
Any ideas?
Nov 2, 2011 at 11:58 PM
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